Abstract

A single isolated attosecond pulse of 67 as was composed from an extreme UV
supercontinuum covering 55–130 eV generated by the double optical
gating technique. Phase mismatch was used to exclude the single-atom cutoff of
the spectrum that possesses unfavorable attochirp, allowing the positive
attochirp of the remaining spectrum to be compensated by the negative dispersion
of a zirconium foil. Two algorithms, PROOF and FROG-CRAB, were employed to
retrieve the pulse from the experimental spectrogram, yielding nearly identical
results.

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